<!doctype <html>
<head>
    <meta charset="UTF-8">
    <title>这是一个网站</title>
</head>
<body>
<h1>1级标题</h1>
<h2>2级标题</h2>
<h3>3级标题</h3>
<h4>4级标题</h4>
<h5>5级标题</h5>
<h6>6级标题</h6>
<img src="https://www.baidu.com/img/baidu.g">
<a href="https://www.baidu.com/">百度</a>
</body>
</html>